Mandrel press



18 1927. u I Jf G. CQLLINS 1,645,521

MANDREL PRES S IFUMMM Patented Oct. 18, 1927.

UNITED STATES JAMES G. COLLINS, OF KALAMAZOO, MICHIGAN, ASSIGNOR TO ATLAS OF KALAMAZOO, MICHIGAN.

y 1,645,521 4PATENT OFFICE.

PRESS COMPANY,

MANDREL PRESS.

Application filed December The main object ofthis invention is to provide an improved mandrel press .of the screw type which is powerful and easily operated, and may be quickly reversed for' advancing or retracting the ram.

A further object is to provide anV improved mandrel press embodying these advantages which is very economical 1n structure and at the same time strong and durable. v

Objects pertaining to details and economies of my invention will definitely appear from the detailed description to follow. I accomplish the objects ofmy invention by the devices and mea-ns described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing forming a part of this application, in which:

Fig. 1 is a front elevation of my improved mandrel press partially in section on a line corresponding to line 1 1 of Fig. 3;

Fig. 2 is a. fragmentary end elevation; and

Fig. 3 is a fragmentary view mainly in section on a line corresponding to line 8-3 of Fig. 1.

Referring to the drawing, the frame of my improved press in the embodiment illustrated comprises a pair of base members 1, uprights 2, bottom cross-pieces 3, and top cross-pieces 1, these cross-pieces being secured to the edges of the uprights. The intermediate cross-pieces 5 constitute supports for the work.

The externally screw-threaded ram 6 is disposed through a vertical bore 7 in the head casting 8. This head casting has a part 9 fitting between the top cross-pieces 4;.

and shouldered at 10 to engage the lower edge ther'eof. The head casting has a recess 11 disposed transversely of the bore 7 to receive the ram driving nut 12. This driving nut is shouldered at 13 to receive la thrust bearing consisting of the annular ball race 14 engaging the head casting and the ball race 15 resting on the shoulder 13, with bearing balls 16 between these ball races.

The beveled gear 17 is fixed to the nut to rotate therewith. rotatably mounted in the arm 19 of the head casting and has a pinion 20 at its inner end The driving shaft 18 is 11, 1925. Serial No. 74,805.

'meshing with the gear 17. The ratchet wheel 21 is splined to this driving shaft 18 spring 27. This pawl is provided with a.

nger piece 28 aty its outer end so that it may be reversed to drive the ratchet wheel in either direction for retracting or advancing the ram.

The hand wheel 29 keyed to the outer' end o f the shaft 18 serves to retain the pawl carrier 24 upon the ratchet wheel. The pawl carrier is provided with a lever 30. The ram is held against rotation by its engagement with the work.

My improved mandrel press is very simple and economical in structure and, although powerful, is compact and light in weight so that it is well adapted for use in garages and the like.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a mandrel press, the combination y with a frame provided with a pair of spaced cross-members, of a threaded ram, a head casting having a portion fitting between said cross-members and shouldered to engage the lower edges thereof, said head casting having a vert-ical b ore therein for said ram and a recess disposed transversely of said vertical bore, a nut arranged in said recess and provided with a gear, said nut being shouldered atits upper end -to receive a thrust bearing, a thrust bearing arranged on said nut shoulder to coact with said head casting, a driving shaft rotatably mounted in said head casting and provided with a pinion meshing with said gear on said nut, a ratchet wheel on said shaft, a pawl carrier rotatably mounted on said ratchet wheel and provided with a lever, a reversible spring-pressed pawl on said pawl carrier coacting'with said ratchet wheel, and a hand wheel on said driving shaft at the outer side of said ratchet wheel, said hand wheel constituting a retaining means for said pawl carrier.

2. In a mandrel press, the combination with a frame provided with va pair of spaced cross-members, of a threaded ram,

a head casting having a portion fitting betiveen'said Across-'members and shouldered to engage the lotver edges thereof, said head casting having a vertical bore therein for said ram and a recess disposed transversely of said vertical bore, a nut arranged in said recess and provided With a gear, said nut being shouldered at its upper end to receive a thrust bearing, al thrust bearing arranged on said nut shoulder to coact with said head casting, a driving shaft rotatably.

mounted in said head casting and provided with a pinion meshing with said gear on said nut, a ratchet `Wheel on said shaft, a pawvl carrier rotatably mounted on said ratchet Wheel andprovided with a lever, and a reversible spring-pressed pawl on said paWl carrier ooacting with said ratchet Wheel.

3. In a mandrel press, the combination with a frame, of a threaded ram, a nut coacting With said ram provided With a gear, a driving shaft provided with a pinion meshingwith said gear on said nut, a ratchet Wheel on said shaft, a paivl carrierr rotatably mounted on said ratchet Wheel and provided With a lever, a reversible spring-pressed pawl on said paWl carrier coacting'with said ratchet Wheel,

and a hand Wheel on said driving shaft at the outer side of saidratchet Wheel, said hand Wheel constituting a retaining means for said pawl carrier. y

t, In a mandrel press, the combination of a frame, a threaded ram, a nut coacting with said ram, a driving ratchet for said nut provided With cylindrical bearings at each side of its teeth, a pavvl carrier rotatably lmounted on said bearings and provided with a reversible pavvl coacting with said teeth and With a lever whereby the ratchet Wheel may be driven in either direction. l

5. In a mandrel press, the combination of a frame, a threaded ram, a nut coacting With said ram provided with av gear, a driving shaft provided with a pinion meshing With said gear on vsaid nut, a. ratchet wheel on said shaft provided with an annular t series of teeth and With a peripheral bearing, a paivl carrier rotatably mounted on said bearing and provided Withl a lever, -and a reversible paivl on said paWl carrier coacting with the teeth of the ratchet.

In Witness whereof I have hereunto set my hand.

JAMES G. COLLINS. 

